#include <stdio.h>
//凶手问题
int main()
{
	int murderer = 0;
	for (murderer = 'a'; murderer <= 'd'; murderer++)
	{
		if ((murderer != 'a') + (murderer == 'c') + (murderer == 'd') + (murderer != 'd') == 3)
		{
			printf("murderer = %c\n", murderer);
		}
	}
	return 0;
}